Mongolian Journal of Chemistryhttp://mongoliajol.info/index.php/MJC
<p>Published by the Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences.</p><p>The Mongolian Journal of Chemistry is included on <a title="DOAJ" href="https://doaj.org/toc/2414-0082" target="_blank">DOAJ</a></p>Institute of Chemistry and Chemical Technology, MASen-USMongolian Journal of Chemistry2226-6739<p>Copyright on any research article in the Mongolian Journal of Chemistry is retained by the author(s).</p><p>The authors grant the Mongolian Journal of Chemistry a license to publish the article and identify itself as the original publisher.</p><p><a href="http://creativecommons.org/licenses/by/4.0/" rel="license"><img style="border-width: 0;" src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons Licence" /></a><br />Articles in the Mongolian Journal of Chemistry are Open Access articles published under a <a href="http://creativecommons.org/licenses/by/4.0/" rel="license">Creative Commons Attribution 4.0 International License</a> CC BY.</p><p>This license permits use, distribution and reproduction in any medium, provided the original work is properly cited.</p>

Prefacehttp://mongoliajol.info/index.php/MJC/article/view/738
Enkhtuul S
Copyright (c) 2016 Enkhtuul S
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-0317433Investigation on pyrolysis of some organic raw materialshttp://mongoliajol.info/index.php/MJC/article/view/739
We have been working on pyrolysis of some organic raw materials including different rank coals, oil shale, wood waste, animal bone, cedar shell, polypropylene waste, milk casein and characterization of obtained hard residue, tar and pyrolytic water and gas after pyrolysis. The technical characteristics of these organic raw materials have been determined and the thermal stability characteristics such as thermal stability indices (T<sub>5%</sub> and T<sub>25%</sub>) determined by using thermogravimetric analysis. The pyrolysis experiments were performed at different heating temperatures and the yields of hard residue, tar, pyrolysis water and gaseous products were determined and discussed. The main technical characteristics of hard residue of organic raw materials after pyrolysis have been determined and the adsorption ability of pyrolysis hard residue and its activated carbon of organic raw materials also determined. The pyrolysis tars of organic raw materials were distilled in air condition and determined the yields of obtained light, middle and heavy fractions and bitumen like residue with different boiling temperature. This is the first time to investigate the curing ability of pyrolysis tars of organic raw materials for epoxy resin and the results of these experiments showed that only tar of milk casein has the highest (95.0%), tar of animal bone has certain (18.70%) and tars of all other organic raw materials have no curing ability for epoxy resin.Purevsuren BDavaajav YaBatbileg SAriunaa ANamkhainorov JJargalmaa STsatsral GBat-Ulzii BErdenechimeg RBattsetseg MAvid BBatkhishig DDugarjav J
Copyright (c) 2016 Purevsuren B, Davaajav Ya, Batbileg S, Ariunaa A, Namkhainorov J, Jargalmaa S, Tsatsral G, Bat-Ulzii B, Erdenechimeg R, Battsetseg M, Avid B, Batkhishig D, Dugarjav J
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-03174351310.5564/mjc.v17i43.739Chemical constituents of aerial parts of Thymus gobicus and their cholinesterase inhibitory activitieshttp://mongoliajol.info/index.php/MJC/article/view/740
From an acetone-water (3:2) extract of aerial parts of Thymus gobicus Czern. (31.1 g), compounds 1-8 were obtained using high-performance liquid chromatography. Based on spectroscopic data, the isolated compounds were identified as rosmarinic acid (1), monardic acid A (2), nepetoidin B (3), aromadendrin (4), apigenin (5), chrysoriol (6), apigenin 7-O-β-D-glucuronopyranoside (7), and apigenin 7-O-β-D-glucuronopyranoside methyl ester (8). Compound 2 was a (7R,8R)-diastereomer of lithospermic acid (2a). Although it was reported that the anti-allergic activity of lithospermic acid was higher than that of 2, the acetylcholine inhibitory activity of 2 was higher than that of lithospermic acid.Odonbayar BT MurataN MatsumotoBatkhuu JK Sasaki
Copyright (c) 2016 Odonbayar B, T Murata, N Matsumoto, Batkhuu J, K Sasaki
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743141710.5564/mjc.v17i43.740Arsenic removal from waste water by ozone oxidation combined with ferric precipitationhttp://mongoliajol.info/index.php/MJC/article/view/741
The oxidation of As(III) to As(V) followed by precipitation and adsorption is thought to be the most effective process for removal of arsenic in industrial wastewater. In this work, the oxidation of As(III) to As(V) with ozone was carried out in an acidic solution. After oxidation, arsenic was removed by precipitation in an iron (III) sulfate system under ambient pressure at 90°C in acid. Batch experimental results show that ozone is quite effective in oxidizing As(III) at low pH. And more than 90% of 5g/l As(III) was removed from the acidic solution by precipitation with Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> in 7-8 hours.Otgon NG ZhangC Yang
Copyright (c) 2016 Otgon N, G Zhang, C Yang
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743182210.5564/mjc.v17i43.741Investigation of dissolved N<sub>2</sub>O production processes during wastewater treatment system in Ulaanbaatarhttp://mongoliajol.info/index.php/MJC/article/view/742
Nitrous oxide (N<sub>2</sub>O) is an increasing greenhouse gas in the troposphere and a potential destroyer of stratospheric ozone layer. Wastewater treatment plant (WWTP) is one of the anthropogenic N<sub>2</sub>O sources because inorganic and organic nitrogen compounds are converted to nitrate (NO<sub>3</sub>-, in the case of standard system) or N<sub>2</sub> (in the case of advanced system) by bacterial nitrification and denitrifcation processes in WWTP. These major processes can be distinguished by isotopocule analysis. In order to reveal production mechanisms of N<sub>2</sub>O in a standard wastewater treatment, we made water sampling at the central WWTP in Ulaanbaatar. The water samples collected from seven stations including biological reaction tanks were measured for concentration and isotopocule ratios of dissolved N<sub>2</sub>O and other inorganic nitrogen. Dissolved N<sub>2</sub>O concentration was extremely higher than that expected under atmospheric equilibrium (about 9 nmol/l) at all stations, indicating that this system is a potential source of N<sub>2</sub>O. It showed a gradual increase with the progress of biological reaction and the highest concentration (335.7 nmol/l) was observed at station N5-4 of the aeration tank when the DO was 5.7 mg/l. Nitrification by nitrifying bacteria could actively occur by the concentration of NH<sub>4</sub>+ decreased whereas NO<sub>2</sub>- and NO<sub>3</sub>- showed a temporal and monotonic increase, respectively, under high DO concentration. Although the reported values of site preference (SP) of N<sub>2</sub>O, the difference in <sup>15</sup>N/<sup>14</sup>N ratio between central (α) and terminal (β) nitrogen, produced via NO<sub>2</sub>- reduction (SP(ND)), including both nitrifier and denitrifier denitrification, and NH<sub>2</sub>OH oxidation (SP(HO)) ranged from -10.7‰ to 0‰ and 31.4‰ to 36.3‰, respectively, the observed SP at aeration tank was close to SP(ND) rather than SP(HO). It was ranged from 0.4‰ to 13.3‰ when N<sub>2</sub>O concentration was high, implying that the NO<sub>2</sub>- reduction made a greater contribution to N<sub>2</sub>O production. Slightly elevated SP (13.3‰) only at station N5-1 was derived from the mixing of N<sub>2</sub>O produced via NH<sub>2</sub>OH oxidation and the maximal contribution of this pathway was estimated to be about 40%. In other words, the contribution of NO<sub>2</sub>- reduction was more than 60%.Tumendelger AByambadorj TC BorsA Lorke
Copyright (c) 2016 Tumendelger A, Byambadorj T, C Bors, A Lorke
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743232710.5564/mjc.v17i43.742A brief review on Triazin-pyridazinones: Synthesis and biological activitieshttp://mongoliajol.info/index.php/MJC/article/view/743
A series of substituted triazin-pyridazine compounds were exhibited diverse types of biological activities and synthesized by different methods. These compounds were mainly tested for their anti-inflammatory, anticancer, antifungal and antibacterial activities. These substituted triazin-pyridazine compounds have mild to potent activities on compare with their appropriate reference standards.M Asif
Copyright (c) 2016 M Asif
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743283310.5564/mjc.v17i43.743Simultaneous analysis of major ingredients of Gardenia fruit by HPLC-MS/TQMS methodhttp://mongoliajol.info/index.php/MJC/article/view/744
An efficient, accurate HPLC-MS/TQMS method was introduced for the quantitative/qualitative simultaneous analysis of main ingredients, namely geniposide and genipingentiobioside, in the Gardenia fruit. The separation was successfully obtained using a C<sub>8</sub> (100mm×2.1mm, 5μm, 30°C) column by gradient elution with ultrapure water as mobile phase, where flow rate was set to 0.2 ml/min and detection wavelength at 240 nm. The analytical method was validated and the quantification of active compounds, namely genipingentiobioside and gardenoside, was performed. Linearity, precision, repeatability, stability and recovery were also reported. The quantitative analysis revealed that both main ingredients as geniposide and genipingentiobioside have performed a good linear relationship in 0.1-100 mg/ml concentration range (r=1.00000 and r =0.99998). The average content was measured to be 4.842% with RSD 0.96% for geniposide and 1.1976% with RSD 0.47% for genipingentiobioside in the Gardenia fruit. Accordingly, this method would be feasible for the quantity and quality control of crude drugs.M GalaqinK UwaiM YuguchiT Iwasa
Copyright (c) 2016 M Galaqin, K Uwai, M Yuguchi, T Iwasa
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743343710.5564/mjc.v17i43.744Effect of pretreatment temperature on catalytic performance of the catalysts derived from cobalt carbonyl cluster in Fischer-Tropsch Synthesishttp://mongoliajol.info/index.php/MJC/article/view/745
The monometallic cobalt-based catalysts were prepared by pretreating the catalysts derived from carbonyl cluster precursor (CO)<sub>6</sub>Co<sub>2</sub>CC(COOH)<sub>2</sub> supported on γ-Al<sub>2</sub>O<sub>3</sub> with hydrogen at 180, 220, and 260°C respectively. The temperature effect of the pretreatments on the structure evolution of cluster precursors and the catalytic performance of the Fischer-Tropsch (F-T) synthesis was investigated. The pretreated catalyst at 220°C with unique phase structure exhibited best catalytic activity and selectivity among three pretreated catalysts. Moreover, the catalysts exhibited high dispersion due to the formation of hydrogen bonds between the cluster precursor and γ-Al<sub>2</sub>O<sub>3</sub> support.Byambasuren OUlziibayar DChiibaatar D
Copyright (c) 2016 Byambasuren O, Ulziibayar D, Chiibaatar D
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743384110.5564/mjc.v17i43.745Anti-oxidative, acetylcholinesterase and pancreatic lipase inhibitory activities of compounds from Dasiphora fruticosa, Myricaria alopecuroides and Sedum hybridumhttp://mongoliajol.info/index.php/MJC/article/view/746
Total of 35 phenolics and flavonols were isolated from flowers and leaves of Dasiphora fruticosa Rydb., from branches of Myricaria alopecuroides Schrenk. and from the herb of Sedum hybridum L. The isolated compounds were identified on the basis of spectral data and tested for their anti-oxidative, acetylcholinesterase and pancreatic lipase inhibitory activities.Quercetin glycosides, gallic acid, (-)EGCG and gossypetin-8-O-xylopyranoside tellimagrandin II exhibited strong anti-oxidative activity by the DPPH scavenging method. The acetylcholinesterase inhibitory activity of quercetin glycosides and (-)EGCG was higher than those of other compounds. Whereas, tellimagrandin II, (-)EGCG and gallic acid derivatives exhibited the most potent inhibitory activity against the pancreatic lipase enzyme among the isolated compounds. Only (-)EGCG showed a prominent activity against all assayed experiments. It was concluded that these plants could be studied further for their potential as anti-oxidative, anti-aging and lipid lowering active products.Odontuya G
Copyright (c) 2016 Odontuya G
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743424910.5564/mjc.v17i43.746Characterization of Mongolian natural minerals and their application for heavy metal adsorbenthttp://mongoliajol.info/index.php/MJC/article/view/747
In this study, the structural characteristic and the adsorption properties of heavy metals on Mongolian natural minerals were investigated. The natural samples were confirmed as Heulandite group of Clinoptilolite type zeolite and clay sample that contains albite and quartz by X-ray diffraction analysis. According to BET surface analysis, natural zeolites have mesoporous type of pore. The results of adsorption study showed that adsorption ability of natural zeolite is high effective for lead ion in acidic aqueous solution and the order of heavy metal selectivity was Pb<sup>2+</sup>&gt;&gt;Zn<sup>2+</sup>&gt;Cd<sup>2+</sup>. The adsorption performance of Arsenic(V) is significantly increased by modification with magnesium oxide on natural zeolite.Munkhbat DK ShiomoriOchirkhuyag B
Copyright (c) 2016 Munkhbat D, K Shiomori, Ochirkhuyag B
http://creativecommons.org/licenses/by/4.0
2017-02-032017-02-031743505410.5564/mjc.v17i43.747